Quote:
Originally Posted by jonesb930
Chris, Would I be able to fire two channels at the same time (using 2 6 channel boxes) for twin plug setup with a Motec M600?
Is this what was used in Tom's build?
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Tom's engine has 2x M&W 3-channel CDI boxes and 2x Bosch triple coil packs (3x2 wasted spark). TurboKraft usually stocks both these items, plus the plug wires.
From there you can wire it 2 ways:
(1) Use 6 channels out of the M600, full sequential ignition. Wire them in the firing order, both to alternating CDIs and coil packs. Cylinders 1 - 2 - 3 are CDI#1 and coil pack #1; cylinders 6 - 4 - 5 (firing order) are CDI#2 and coil pack #2. Coil 1 (both terminals) on pack #1 go to cylinder 1, coil 2 to cylinder 2, etc. etc. Basically, each cylinder gets its own coil.
You can also use their larger 6-channel CDI for this configuration.
(2) Use 3 channels out of the ECU and wire it up like a pair of standard wasted spark systems in parallel -- one for the upper bank of plugs, one for the lower. Each channel out of the M600 triggers both CDIs simultaneously. Yes, not the most efficient configuration -- I get that. But it also supports over 600rwhp, so it's not like it's inefficient either.
The advantage here is redundancy: loose a coil or CDI, and you can still drive the car home. We like to do this for street cars for obvious reasons.
AEM -- don't know about their new C2DIs, but their old ones said they could fire both capacitors (2x/box, thus the name C2DI). You should have been able to use 1x 8-ch C2DI to run both 6-pack (2x3) coils like above. But... In reality, they couldn't do this. Ask both caps to fire at once and they usually melted on you. Call the engineers up and they'll tell you it can't work that way, just "wire it up like the Supra guys" (show me a twin-plug Supra, please).
I'm hoping their new C2DIs are the real deal.
We'll test one on a forthcoming twin plug built 3.3L 930 (head work, SC cams, GT35R, RarlyL8 headers, TurboKraft intercooler, TK AEM system) and post the results.
We're still going to build the wiring harness to accept either the AEM or M&W CDIs, just in case...